Accessing the DBContext from classes in 2 different projects when one reads from DBContextBase and the other from DomainDBContext

Question

I have a shared project that I put my shared and base logic in to reuse in other projects and a Normal asp.net core project on top of it.

In the Shared base project I have:

class DbContextBase : DbContext
{
  public DbSet<ActivityLog> ActivityLogs { get; set; }
  public DbSet<Event> Events { get; set; }
  SaveChanges(...)
}

class MyEventProcessor
{
   private readonly DbContextBase _databaseContext;
   public MyEventProcessor(DbContextBase databaseContext)
   {
      _databaseContext=databaseContext;
   }
   public void AddEvent(Event e){}
   public void ProcessEvent(Event e){}
}

In the .net core webApi one I have my domain specific logic

class MyDomainDbContext : DbContextBase
{
  public DbSet<User> Users{ get; set; }
}

class UserRepository
{
     private readonly MyDomainDbContext _databaseContext;
     public UserRepository(MyDomainDbContext databaseContext){_databaseContext=databaseContext;}
}

public class Startup
   {
      public Startup(IConfiguration configuration)
      {
        services.AddDbContext<MyDomainDbContext>([options]);
        services.AddScoped<UserRepository>();
        services.AddScoped<EventProcessor>();
      }
   }

The problem is, this way it fails on startup not being able to find DbContextBase because it is not registered. I thought of changing the registeration to an interface like below, but then obviously I won't have access to my domain's DbSets in my repositories.

services.AddDbContext<IDbContextBase,MyDomainDbContext>([options]);

So the question is, how do I set this so that MyEventProcessor and UserRepository can read and write into the same Database context.

Darjan Bogdan · Accepted Answer · 2019-05-10 09:17:49Z

3

You need to register both types: DbContextBase and MyDomainDbContext, however the point is to reuse the same instance for both cases, in order to achieve that you can register them in a following way:

services.AddDbContext<MyDomainDbContext>([options]);
services.AddScoped<DbContextBase, MyDomainDbContext>(sp => sp.GetRequiredService<MyDomainDbContext>());

That way, you'll be able to inject both types, and both types will actually be the same instance, which you can easily check using GetHashCode or similar.

edited May 10, 2019 at 9:17

answered May 10, 2019 at 8:35

Darjan Bogdan

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